PHP is how to determine the mobile phone, computer access to automatically skip the file

PHP to determine the mobile phone computer access automatic jumping head file code as follows:

<?php  function is_mobile_request ()    {    $_server[' all_http '] =  isset ($_server[' all_http '])  ? $_server[' all_http '] :  ' ';     $mobile _ browser =  ' 0 ';    if (Preg_match ('/(up.browser|up.link|mmp|symbian|smartphone|midp|wap| Phone|iphone|ipad|ipod|android|xoom)/I ',  strtolower ($_server[' http_user_agent '))        $mobile _browser++;    if (isset ($_server[' http_accept '))  and  Strpos (strtolower ($_server[' http_accept ']), ' application/vnd.wap.xhtml+xml ')  !== false)      $ mobile_browser++;    if (isset ($_server[' http_x_wap_profile '))       $mobile _ browser++;    if (isset ($_server[' http_profile '))       $mobile _browser++;
     $mobile _ua = strtolower (substr ($_server[' http_user_agent '],0,4));     $mobile _agents&nbsp= array (        ' w3c  ', ' acs-', ' Alav ', ' Alca ', ' amoi ', ' Audi ', ' Avan ', ' BenQ ') , ' bird ', ' Blac ',        ' Blaz ', ' brew ', ' cell ', ' cldc ', ' cmd-', ' Dang ', ' doco ', ' Eric ', ' Hipt ', ' Inno ',        ' iPAQ ', ' Java ', ' Jigs ', ' kddi ', ' Keji ', ' Leno ', ' lg-c ', ' lg-d ', ' Lg-g ', ' lge-',        ' Maui ', ' Maxo ', ' MIDP ', ' mits ', ' mmef ', ' mobi ', ' mot-', ' Moto ', ' MWBP ', ' nec-',        ' Newt ', ' Noki ', ' oper ', ' palm ', ' pana ', ' Pant ', ' Phil ', ' play ', ' Port ', ' ProX ',        ' qwap ', ' sage ', ' Sams ', ' Sany ', ' sch-', ' sec-', ' send ', ' Seri ', ' sgh-', ' Shar ',        ' sie-', ' Siem ', ' smal ', ' Smar ', ' Sony ', ' sph-', ' symb ', ' t-mo ', ' Teli ', ' tim-',        ' tosh ', ' tsm-', ' upg1 ', ' upsi ', ' vk-v ', ' Voda ', ' wap-', ' wapa ', ' Wapi ', ' Wapp ',        ' wapr ', ' webc ', ' winw ', ' winw ', ' xda ', ' xda-'      );    if(In_array ($mobile _ua,  $mobile _agents))       $mobile _browser++;    if ( Strpos (Strtolower ($_server[' all_http '),  ' Operamini ')  !== false)       $mobile _browser++;    // pre-final check to reset everything if the  user is on Windows    if (Strpos strtolower ($_server[' http_user_agent '),   ' windows ')  !== false       $mobile _browser=0;    // but  wp7 is also windows, with a slightly different characteristic     if (Strpos (Strtolower ($_server[' http_user_agent ')),  ' Windows phone ')  !==  False)       $mobile _browser++;    if ($mobile _browser>0)     
 return true;    else   return false; }      if (is_mobile_requesT ()) {  header ("location:app/index.html"), Exit (),} else{  header ("location:index/index.html"), exit ();  }?>

The above is PHP to determine the mobile phone computer access to automatically jump the file code, the need for small partners, can be modified according to the actual needs.